Quick clone of NSObjects using NSArchiver

Clonable.swift

// https://medium.cobeisfresh.com/accessing-types-from-extensions-in-swift-32ca87ec5190

public protocol Clonable {
    func clone() throws -> Self?
}

public protocol Clonable {
    func clone() throws -> Self
}

public struct CloneError: Error, CustomStringConvertible {
    let file: String
    let line: Int
    let summary: String
    
    public var description: String { "CloneError (\(file):\(line)) \(summary)" }
    
    init (_ msg: String, file: String = #file, line: Int = #line) {
        summary = msg
        self.file = file
        self.line = line
    }
}

public func clone<S: AnyObject>(_ nob: S, fin: ((inout S) -> Void)? = nil) throws -> S {
    throw CloneError("Unable to clone Class '\(type(of: nob))'")
}

public func clone<S: NSCopying>(_ nob: S, fin: ((inout S) -> Void)? = nil) throws -> S {
    var clone = nob.copy() as! S
    fin?(&clone)
    return clone
}

public func clone<S: Clonable>(_ nob: S, fin: ((inout S) -> Void)? = nil) throws -> S {
    var clone = try nob.clone()
    fin?(&clone)
    return clone
}

public func clone<S: Codable>(_ nob: S, fin: ((inout S) -> Void)? = nil) throws -> S {
    let encoder = JSONEncoder()
    let decoder = JSONDecoder()
    
    let data = try encoder.encode(nob)
    var clone = try decoder.decode(S.self, from: data)
    fin?(&clone)
    return clone
}


@objc class Bob: NSObject {
    var name = "George"
}

var str = "Hello, playground"
let cs = try? clone(str)
let bob = Bob()
bob is Clonable
let bc = clone(bob)